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I3. MCGRAIIAHAIII AIIDWI. II. CII'IIIIIII s uIIIAcI'NG MACHINE.

APPLICATION `IfILIiI) MAM, 1919,...

` Mmmm NWI. MI, MMIII c. MCGRANAHAN AND w. H. COWON.

SURYFACING MACHINE.

APPLlcAmN FILED MAY 9,1919.

Patented Nov. 18, 1919.

2 SHEETS-SHEET 2-v www m 0 (m. GM @6 Ww y, ffm. /m C HAN and WALTER H.

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' carried and slidable UNITED singes PATENT cierren.

errantes MCGRANAHAN, oF YoUNes'rowN, omo, AND WALTER H, corromor cHIcAeo, ILLINOIS.

sUnFAcINe-MACHINE.

Application ala May e, 1919.

To all whom t may concern.;

y Be known that we,.CHARLEs h/lGGrRANAI United |States, and residents, respectively, of Youngstown, county of Mahoning, State of UhiO, and Chicago, county of Cook, State of lllinois, have jointly invented certain new and Auseful Improvements inv Surfacing-Ma chines, of which thefollowing isa specification and which are illustrated in the` accompanying drawings, forming a part thereof.

'llhe invention relates particularly to machines for resurfacing choppingblocks. lhe objects ofthe invention are to provide a highly effective yet simple portable machine that can be quickly placed in position and can bev operated by means of anelectric motor incorporated into itv and capable of` using cu-rrents of different potential.

' The linvention is illustrated in `theaccompanying drawings forming a part ofthe specification, and in which Figure 1 is a side elevation showing the application ping block; p

Fig. 2 is a detail endelevation;

Fig. 8 is a detail plan view, some parts being shown in dotted lines;

Figs. 4; and 5 are diagrammatic views of the driving motor, showing different switch positions; l

Fig. 6 is a detail of thev controlling switch board, and Figs. 7 and 8 are front and side views, respectively, of a modified-form of attaching means for the tracks. A meat block of conventional square form, upon which the apparatus is intended to operate, is shown at 10. ln use the surface of these blocks becomes somewhat irregularly concave, and from time to time it becomes necessary to cut away a portion of the upper face in order to again secure a fiat surface. rlhe apparatus herein shown is especially adapted for this work of redressing such blocks. e

lll`he device comprises a circular saw 11, carried by an arbor 12 attached to the armature shaft 13 of a vertically disposed elec tric motor 14C. As shown, the arbor 12 is socketed to receive the shaft 13, and is secured thereto by means of a setwscrew 15.

lhe motor 14.- is mounted upon a frame 1G, upon a pair of parallel bars 17, 18. These bars are ends by a pair of cross-heads 19, 20, each of i Specicationof Letters Patent.

.21, az; the COTTON, citizens of the.

of the machine to a meat chopforth upon the united at their PatentedNov. 1e, 191e.

serial No. 295,871. y f i which is adjustably `attached to Va standard attachment being' by `means of a. lug 23, formed `upon the cross-head, and a screwfbolt 24 setting through the upper end .25 of the standard, and being in threaded engagement with the lug.` Each of the stand? ards 21, 22,` is fitted within a dove-tailed channel in thecrossshead, as `shown at 26, and is'pivotally attached to a carriage 27, as shown at 28. A binding bolt Q9 sets through the lower end of each standard, and is mov` able within a curved slot 30, concentric with thevpivot 28 in the carriage 27,'thereby proi viding means for adjustably tilting the frame carrying the motor and saw for the purpose of'bringing vthe plane ot' the latter to a strictly horizontal position, and also to permit the adj ustment of the saw for beveling the margins of `the block.

The carriages 27 are provided with flanged wheels 3l, 32,'to run on tracks 33, 3&1-, adapted to be secured to opposite sides of the block to be operated upon by any suit able means, spikes-,jas being shown for this purpose. The frame of the motor ma?,r be provided with handles, as 36, 37, by means of which it may be easily moved back and rods 17,18, and the carriages upon the tracks 33, 84C. I

lnasmuch as the apparatus is intended to be employed at various `shops where the `blocks to be dressed are in use, and tobetwo armatures 38, 39, on the shaft 13 common to both, a suitable commutator and the necessary brushes being associated with each armature. There is also provided a local motor circuit and suitable switch to permit the arrangement of the two armatures either in multiple, for the purpose of utilizing the current ofthe lesser voltage, or in series for the purposeof utilizingthe current of the greater voltage.

Such an arrangement is diagrammatically shown in Figs. 4, 5 and 6. The line wires represented at 110, e1, lead to terminals 1 -2,

lil li the armatures 1n multiple, or for connecting the terminals with the brush associated with one armature only, thereby connecting the armaturesA with the leading-in circuit in series, as illustrated in Fig. 5, the armatures being cross connected, as shown at 45.

In use the track rails 33, 34, are secured to the block 10, and in being attached are leveled as accurately as the rather rough character of the Work will permit. The carriages 27 are mounted upon these rails, being adjusted upon the rods 17, 1S, and secured thereto by means of the set-screws 4Q, 47, and the saw is broughtto an exact horizontal plane by such tilting of the motor frame as may be necessary, and to the proper elevationy for making a cut of the proper depth. The motor being now actuated successive cuts are made across the top of the block by moving the motor frame backV andforth upon the rods 17, 18, vand advancing the carriages upon the track rails. This operation having been completed, the motor frame is again tilted to give' the saw the desired angular positions to bevel twoof the marginal edges of the.

block. The remaining margins may be beveled by rearranging the rails upon the block.

The rods 17, 18, and rails 33, 34, are made of suiicient length to adapt them for use on the largest size blocks. In fitting the apparatus to a block, the standard 2() is adjusted along the rods to bring the rollers 31, 32, of the carriage with which it is associated to the vertical plane of the track, thereby also adjusting the range of travel of the motor frame tothe Work to be performed.

As the blocks to be operated upon vary greatly in size and the Working conditions are not uniform, it is important that an apparatus of this character have great flexibility. Such adaptability to different conditions is provided for b v the construction j described.

IVe claim as our invention- 1. In a surfacing machine, in combination, a pair of track rails adapted for attachment to a block to be surfaced, a pair of carriages running on the rails, an oscillatably adjustable standard mounted on each carriage, a pair of bars secured to the standards, a frame slidable on the bars, and a saw arbor mounted on the frame.

Q. In a surfacing machine, in combination, a pair of track rails adapted for attacln'nent toa block to be surfaced, a pair of carriages running on the rails, an angularly adjustable standard mounted on each carriage, a `pair of bars secured to the standards, means for adjusting the bars ver.- tically on the standards, a frame slidable on the bars, and a saw arbor mounted on the frame.

3. In a surfacinc' machine, in coinbination, a pair of tracks adapted to be secured to an article to be surfaced, a pair of carriages comprising a longitudinal member provided with a Wheel at each end adapted to travel on said tracks, an upright pivoted to each member and adjustable about said pivot, a rod support mounted for vertical adjustment on each upright, a pair of rods connecting opposite supports, one of said supports longitudinally adjustable on said rods, a motor casing freely slidable on said rods, a motor in said casing arranged with its shaft perpendicular, and a saw secured to the lower end of said shaft.

4. In a surfacing machine, in combination, a pair ofltracks adapted to be secured to an article to be surfaced, a pair of carriages each comprising a longitudinal member provided with wheels adapted to travel on said tracks, an upright pivoted to each carriage and provided with a set screw spaced from the pivot adapted to coact with an arcuate slot provided in the carriage, a rod support mounted for vertical adjustment on the upright of each carriage, spaced rods connecting opposite supports, and a saw, and driving means therefor loosely supported by and slidable upon the rods.

CHARLES MCGRANAHAN. WALTER H. COTTON. 

